L-aspartyl semialdehyde -15.994915008544921875 -16.0 99.0320281982421875 99.089996337890625 L-aspartyl aldehyde O -1 L-aminosuccinic acid semialdehyde D MOD:00378 natural (S)-2-amino-4-oxobutanoic acid L-beta-formylalanine reduction L-aspartate-beta-semialdehyde A protein modification that effectively converts an L-aspartic acid residue to L-aspartyl semialdehyde. none MOD_RES Aspartyl aldehyde L-aminosuccinaldehydic acid C 4 H 5 N 1 O 2 Deoxy L-aspartic beta-semialdehyde PSI-MOD aspartyl 4-semialdehyde aspartyl aldehyde modified L-aspartic acid residue deoxygenated residue